| 摘要 |
<p>PURPOSE:To prevent secret documents from being copied by detecting a magnetic body with a magnetic sensor, which is provided on a carriage and is moved two-dimensionally, to not only stop the copying operation but also report a danger and erasing a formed image in accordance with a spot light source indicating an erase range. CONSTITUTION:A magnetic sensor 131 is moved tow-dimensionally, and when it passes an identification part ID on the way of return operation, the output signal of the magnetic sensor 131 is changed form the low level to the high level. Though an original is placed, the identification part is detected at a point A or B by the magnetic sensor 131 during the return operation, and when this signal is detected by a main processor group, the original set on an original platen 2 is judged to be a secret document, and the operation of the first carriage 411 is stopped when this carriage reaches a fixed scale, and an alarm signal is outputted. Since the magnetic sensor 131 and an original trimming spot light source 171 are joined into one unit, the discrimination of the secret original and original trimming are performed two-dimensionally. thus, the secret documents are prevented from being copied.</p> |
